Okay, that actually helps.
Instead of makin a change to that, can you try:
– Opening this file on your server: wp-content/plugins/ajax-search-pro/includes/classes/filters/class-asp-elementor.php
– Replacing it’s contents with this: https://gist.github.com/anag0/c8b071a721e73b98d0ab160215ed39d2
– Save & Activate the plugin
If that works, I can include it in the upcoming release.